  <div>
    <div class="alert alert-primary" role="alert">
      <h4 [innerHTML]="question.title">
      </h4>
      <div *ngIf="!choiceHidden">
        <div [innerHTML]="question.choiceA">
        </div>
        <div [innerHTML]="question.choiceB">
        </div>
        <div [innerHTML]="question.choiceC">
        </div>
        <div [innerHTML]="question.choiceD">
        </div>
        <div [innerHTML]="question.choiceE">
        </div>
        <div [innerHTML]="question.choiceF">
        </div>
      </div>
      <div class="alert alert-primary" role="alert" *ngIf="choiceHidden" [innerHTML]="question.content">
      </div>
    </div>
    <div class="alert alert-success" role="alert">
      <strong>正确答案：</strong>
      <label [innerHTML]="question.answer"></label>
    </div>
    <div class="alert alert-info" role="alert">
      <strong>试题解析：</strong>
      <label [innerHTML]="question.analysis"></label>
    </div>
  </div>